Harman Red Sensitive Holographic Plates (4 x 5") from Ilford can be used with a wide range of lasers including Solid State Ruby lasers, HeNe and Krypton Ion gas lasers, both continuous and pulsed. The plates are coated with fine grain holographic emulsion. They are capable of more than 7000 cycles/mm and at 632 nm provide optical transmission better than 80%.